WO2021243626A1 - Technologie phr pour une faible consommation d'énergie - Google Patents

Technologie phr pour une faible consommation d'énergie Download PDF

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Publication number
WO2021243626A1
WO2021243626A1 PCT/CN2020/094275 CN2020094275W WO2021243626A1 WO 2021243626 A1 WO2021243626 A1 WO 2021243626A1 CN 2020094275 W CN2020094275 W CN 2020094275W WO 2021243626 A1 WO2021243626 A1 WO 2021243626A1
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WO
WIPO (PCT)
Prior art keywords
power
headroom value
uplink
switching point
power headroom
Prior art date
Application number
PCT/CN2020/094275
Other languages
English (en)
Inventor
Yuankun ZHU
Qiang Li
Gang Liu
Zhuoqi XU
Pan JIANG
Chaofeng HUI
Fojian ZHANG
Bo Yu
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/094275 priority Critical patent/WO2021243626A1/fr
Publication of WO2021243626A1 publication Critical patent/WO2021243626A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to a power headroom report (PHR) for low power consumption in a user equipment (UE) .
  • PHR power headroom report
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra reliable low latency communications
  • 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • a method, a computer-readable medium, and an apparatus determines an uplink buffer size of the apparatus, determines whether the uplink buffer size of the apparatus is greater than a threshold, determines a reduced power headroom value to control an uplink transmission power when the uplink buffer size is less than or equal to the threshold, and transmits the reduced power headroom value to a network.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • FIGs. 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first 5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame, and UL channels within a 5G/NR subframe, respectively.
  • FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.
  • UE user equipment
  • FIG. 4 illustrates power consumption of a power amplifier in a UE in relation to transmission power.
  • FIG. 5 illustrates the current consumption of a power amplifier for different transmission power values and for different transmission frequency bands.
  • FIG. 6 illustrates a signal flow diagram in accordance with various aspects of the present disclosure.
  • FIG. 7 is a flowchart of a method of wireless communication for a UE in accordance with various aspects of the present disclosure.
  • FIG. 8 is a flowchart of a method of wireless communication for a UE in accordance with various aspects of the present disclosure.
  • FIG. 9 is a conceptual data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • FIG. 10 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the aforementioned types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through backhaul links 132 (e.g., S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through backhaul links 184.
  • NG-RAN Next Generation RAN
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over backhaul links 134 (e.g., X2 interface) .
  • the backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs Home Evolved Node Bs
  • HeNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc.
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia,
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • a base station 102 may include an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE 104.
  • mmW millimeter wave
  • mmW millimeter wave
  • mmW base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters.
  • Radio waves in the band may be referred to as a millimeter wave.
  • Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave.
  • Communications using the mmW /near mmW radio frequency band (e.g., 3 GHz –300 GHz) has extremely high path loss and a short range.
  • the mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.
  • the base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182'.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182”.
  • the UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Internet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • the base station may also be referred to as a gNB, Node B, evolved Node B (eNB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the UE 104 may be configured to determine a reduced power headroom value to control an uplink transmission power (198) .
  • a reduced power headroom value to control an uplink transmission power (198) .
  • FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure.
  • FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe.
  • FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure.
  • FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe.
  • the 5G/NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) .
  • slot formats 0, 1 are all DL, UL, respectively.
  • Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots.
  • Subframes may also include mini-slots, which may include 7, 4, or 2 symbols.
  • Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) .
  • the number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies ⁇ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology ⁇ , there are 14 symbols/slot and 2 ⁇ slots/subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ *15 kKz, where ⁇ is the numerology 0 to 5.
  • ⁇ is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the subcarrier spacing is 15 kHz and symbol duration is approximately 66.7 ⁇ s.
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
  • the RS may include demodulation RS (DM-RS) (indicated as R x for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM-RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • FIG. 2B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity.
  • a secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block.
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 2D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network.
  • IP packets from the EPC 160 may be provided to a controller/processor 375.
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDU
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) .
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160.
  • the controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with 198 of FIG. 1.
  • FIG. 4 illustrates power consumption of a power amplifier in a user equipment (UE) in relation to transmission power.
  • the power amplifier may be a linear amplifier configured to drive one or more antennas of the UE.
  • the power consumption of the power amplifier generally increases as the transmission power increases.
  • the term transmission power as used herein may refer to an amount of power the UE may apply (e.g., via a power amplifier) for transmission of an uplink signal.
  • the power consumption may not increase in a directly proportional manner for all transmission power values.
  • the power consumption may increase in steps based on the operation mode of the power amplifier at certain transmission power values. Each operation mode of the power amplifier may correspond to a different amplification state of the power amplifier.
  • the transmission power 402 may increase proportionally with increasing transmission power when the power amplifier is in a first operation mode 408.
  • the power amplifier may enter a second operation mode 410.
  • the power consumption of the power amplifier may increase to a value that is approximately four times greater than the highest power consumption value in the first operation mode 408.
  • the transmission power 402 may continue to increase proportionally with increasing transmission power when the power amplifier is in the second operation mode 410.
  • the power amplifier may enter a third operation mode 412. For example, when the power amplifier enters the third operation mode 412 at the second transmission power value TP 2 416, the power consumption of the power amplifier may increase to a value that is approximately two times greater than the highest power consumption value in the second operation mode 410. As shown in FIG. 4, the transmission power 402 may continue to increase proportionally with increasing transmission power when the power amplifier is in the third operation mode 412. In FIG. 4, the third transmission power value TP 3 418 may represent the maximum transmission power of the power amplifier.
  • the transmission power value at which the power amplifier transitions from one operation mode to another operation mode may be referred to as a switching point.
  • a switching point e.g., the first transmission power value TP 1 414, the second transmission power value TP 2 416
  • FIG. 4 involves a power amplifier designed to have three operation modes and two switching points, it should be understood that a power amplifier may have a different number of operation modes and switching points in other examples.
  • the switching points of a power amplifier may be set differently for different transmission frequency bands. For example, when a UE is configured to operate within a first frequency band ranging from approximately 2.5 GHz to approximately 2.6 GHz (also referred to as frequency band N41) , the first switching point (also referred to as the low switching point) may be set to a transmission power value of 2 decibels per milliwatt (dbm) and the second switching point (also referred to as the high switching point) may be set to a transmission power value of 14 dbm.
  • dbm decibels per milliwatt
  • the first switching point e.g., the low switching point
  • the second switching point e.g., the high switching point
  • FIG. 5 illustrates the current consumption of a power amplifier for different transmission power values and for different transmission frequency bands.
  • the vertical axis represents the current consumption (e.g., in milliamps (mA) ) of the power amplifier and the horizontal axis represents the transmission power (e.g., in decibels per milliwatt (dbm) ) .
  • the power consumption of the power amplifier may be determined by obtaining the product of this input voltage and the current consumption of the power amplifier.
  • the solid line 502 in FIG. 5 represents the current consumption of the power amplifier when the UE is operating in the first frequency band (e.g., frequency band N41) and the dashed line 504 in FIG. 5 represents the current consumption of the power amplifier when the UE is operating in the second frequency band (e.g., frequency band N78) .
  • the first switching point 506 of the power amplifier may be set to 2 dbm and the second switching point 508 of the power amplifier may be set to 14 dbm.
  • the first switching point 506 of the power amplifier may be set to 2 dbm and the second switching point 508 of the power amplifier may be set to 14 dbm.
  • the first switching point 510 of the power amplifier may be set to -5 dbm and the second switching point 512 of the power amplifier may be set to 2 dbm.
  • the current consumption values indicated in FIG. 5 may represent the amount of current consumed for UL transmissions in each slot of a radio frame.
  • the radio frame may contain a total of 20 slots.
  • the power amplifier may consume approximately 2 mA of current for transmission power values below the first switching point 506. As can be further seen in FIG. 5, the power amplifier may consume between approximately 5 mA and 11 mA of current for transmission power values below the second switching point 508. For transmission power values exceeding the second switching point, however, the power amplifier may consume more than 25 mA of current. Therefore, in view of these current consumption values of the power amplifier, it can be understood that the power amplifier may consume significantly more power for transmission power values exceeding the second switching point 508 relative to transmission power values below the second switching point 508.
  • the UE may determine the transmission power for an uplink transmission (e.g., an uplink transmission in the PUSCH) based on equation (1) :
  • P PUSCH, b, f, c (i, j, q d , l) is the PUSCH transmission power
  • P CMAX, f, (i) is the UE configured maximum output power for carrier f of serving cell c in PUSCH transmission occasion i
  • P 0_PUSCH, b, f, c (j) is a parameter composed of the sum of a component P 0_NOMINAL_PUSCH, f, c (j) and a component P 0_UE_PUSCH, b, f, c (j)
  • j ⁇ ⁇ 0, 1, ..., J-1 ⁇ is the bandwidth of the PUSCH resource assignment expressed in number of resource blocks for PUSCH transmission
  • ⁇ b, f, c represents a path loss compensation factor
  • PL b, f, c may represent a downlink pathloss estimate in dB determined by the UE using reference signal (RS) index q d for the active DL BWP
  • P 0_PUSCH, b, f, c may represent a target signal-to-interference-plus-noise-ratio (SINR) set by an initial P 0 value.
  • SINR target signal-to-interference-plus-noise-ratio
  • the value of P PUSCH, b, f, c (i, j, q d , l) is subject to P CMAX, f, c (i) (e.g., P PUSCH, b, f, c (i, j, q d , l) may not exceed P CMAX, f, c (i) ) .
  • the value of the term in equation (1) may typically be larger than the values of the remaining terms in equation (1) . Accordingly, in some examples, the value of the term may have a greater impact on the value of the transmission power P PUSCH, b, f, c (i, j, q d , l) relative to the other terms in equation (1) .
  • each UE in a network may be configured to report its available power headroom to a base station.
  • a UE may generate a power headroom report (PHR) containing the available power headroom and may transmit the power headroom report (PHR) to the base station.
  • the base station may use the power headroom report (PHR) to determine how much uplink bandwidth per subframe the UE can use. This bandwidth allocation determination may avoid scheduling uplink transmission resources to UEs that are unable to fully use them (e.g., UEs where the power headroom is small indicating less available power headroom) .
  • a UE may determine its power headroom by obtaining the difference between the maximum transmit power of the UE and an estimated transmit power for an uplink transmission. For example, the UE may determine the estimated transmit power for an uplink transmission based on equation (2) :
  • P PUSCH, b, f, c (i, j, q d , l) represents the estimated PUSCH transmission power and where the terms P 0_PUSCH, b, f, c (j) , ⁇ b, f, cf , PL b, f, c , ⁇ TF, b, f, c , and f b, f, c are the same terms previously described with reference to equation (1) . Therefore, in some examples, the power headroom of the UE may be expressed as shown in equation (3) :
  • PH b, f, c represents the power headroom value
  • P CMAX, f, (i) is the UE configured maximum output power for carrier f of serving cell c in PUSCH transmission occasion i
  • the P PUSCH, b, f, c is the estimated PUSCH transmission power (e.g., based on equation (2) as described herein) .
  • a UE may generate a power headroom report (PHR) as a medium access control (MAC) control element (MAC-CE) that includes the power headroom value.
  • PHR power headroom report
  • the power headroom report (PHR) may be encoded in a MAC-CE that includes at least two 8-bit fields. In these examples, 6 bits of a first 8-bit field may be used to indicate the power headroom value and 6 bits of a second 8-bit field may be used to indicate P CMAX, f, c (i) .
  • the UE may transmit the MAC-CE to the base station on the PUSCH.
  • the base station may determine valid combinations of modulation-and-coding scheme and number of resource blocks to be allocated to the UE based on the power headroom value.
  • the base station may reduce the number of resource blocks scheduled for the UE (e.g., the base station may reduce the value of the term in equations (1) and (2) ) to ensure that the transmission power of the UE is within a capable range.
  • the base station may then reduce the number of resource blocks scheduled for the UE based on the power headroom value reported by the UE, which may effectively reduce the transmission power of the UE for an uplink transmission. Therefore, it may be said that the power headroom report (PHR) may adjust the transmission power of the UE is some scenarios.
  • FIG. 6 shows a signal flow diagram 600 in accordance with various aspects of the present disclosure.
  • a UE 602 may optionally determine a power headroom value associated with an uplink transmission.
  • the UE may determine the power headroom value (e.g., PH b, f, c (i, j, q d , l) ) using equation (3) as described herein.
  • the UE 602 may determine a reduced power headroom value to control an uplink transmission power when the uplink buffer size at the UE 602 is less than or equal to a threshold.
  • the uplink buffer size being less than or equal to a threshold may serve as an indication that the current throughput at the UE 602 is adequate and, therefore, an increase in throughput at the UE 602 may not be needed.
  • the reduced power headroom value may enable the UE 602 to maintain a transmission power that is below a highest switching point of the power amplifier of the UE 602, thereby preventing the power amplifier from switching to a different mode that may increase power consumption at the power amplifier.
  • the UE may determine the reduced power headroom value by applying equation (4) :
  • PH Reduced represents the reduced power headroom value
  • PA_switching_point represents a switching point of the power amplifier of the UE 602
  • current P PUSCH represents a current transmission power of the UE 602 for uplink transmissions.
  • the PA_switching_point may be set to the highest switching point of the power amplifier.
  • the value of the PA_switching_point and the value of the current P PUSCH may be expressed in decibels per milliwatt (dbm) ) .
  • the value of PA_switching_point is less than the value of the UE configured maximum output power for a carrier of a serving cell (e.g., P CMAX, f, c (i) ) .
  • the difference between the PA_switching_point and the current P PUSCH may be reduced by one (e.g., 1 dbm) as shown in equation (4) . This may ensure that the value of PH Reduced indicates a power headroom value relative to a transmission power that is less than the PA_switching_point.
  • the UE 602 may generate a power headroom report (PHR) .
  • the power headroom report (PHR) may include the reduced power headroom value (e.g., PH Reduced ) .
  • the UE 602 may transmit the power headroom report (PHR) to a base station 604 in an uplink transmission 612.
  • the base station 604 may transmit an uplink resource allocation to the UE 602 (e.g., in a downlink (DL) transmission 614) based on the power headroom report (PHR) .
  • the uplink resource allocation may indicate a number of resource blocks (e.g., in equations (1) and (2) ) assigned to the UE 602 for an uplink transmission.
  • the base station 604 may determine the number of resource blocks (e.g., in equations (1) and (2) ) based on the reduced power headroom value (e.g., PH Reduced ) .
  • the UE 602 may determine a transmission power for an uplink transmission (e.g., P PUSCH, b, f, c ) based on the UL resource allocation. For example, the UE 602 may determine the value of P PUSCH, b, f, c using equation (1) described herein, where the UL resource allocation from the base station 604 indicates the value of the term
  • the base station 604 may set a lower value for as compared to a scenario where the value for is set based on the power headroom value (e.g., 11 dbm in the example described above) . Accordingly, the value of set by the base station 604 based on PH Reduced may allow the transmission power of the UE 602 (e.g., P PUSCH, b, f, c ) to remain below the highest switching point of the power amplifier of the UE 602. As a result, the power amplifier of the UE 602 may avoid switching to a different operating mode that may increases power consumption at the power amplifier.
  • the transmission power of the UE 602 e.g., P PUSCH, b, f, c
  • FIG. 7 is a flowchart 700 of a method of wireless communication for a user equipment (UE) (e.g., UE 104, 602; the apparatus 902/902') in accordance with various aspects of the present disclosure.
  • the UE may enter a radio resource control (RRC) connected state.
  • RRC radio resource control
  • the UE may obtain at least one switching point of a power amplifier of the UE (e.g., the power amplifier 1011 in the transceiver 1010) via a radio frequency (RF) configuration.
  • the at least one switching point may include the highest switching point (e.g., the value 14 dbm indicated on the solid line 502 in FIG. 5) of the power amplifier.
  • the UE may determine an uplink buffer size of the UE.
  • the uplink buffer size may indicate an amount of data (e.g., a data size) that the UE is planning to transmit.
  • the UE may determine whether the uplink buffer size is greater than a threshold.
  • the threshold may be a preconfigured buffer size value.
  • the value of the threshold may be set to 3 kilobytes.
  • the value of the threshold may be configurable.
  • the value of the threshold may be set to a default value of 3 kilobytes and may be increased to a higher value (e.g., a higher buffer size value) when the UE needs higher throughput, or may be decreased to a lower value (e.g., a lower buffer size value) when the UE can operate with a lower throughput.
  • the UE may determine a reduced power headroom value to control an uplink transmission power of the UE. In some aspects of the present disclosure, the UE may determine the reduced power headroom value by applying equation (4) as previously described. At block 710, the UE may generate a power headroom report (PHR) . In some aspects of the disclosure, if the UE has determined a reduced power headroom value, the UE may include the reduced power headroom value (e.g., PH Reduced ) in the power headroom report (PHR) .
  • PHR power headroom report
  • the reduced power headroom value may reduce the number of resource blocks in a UL grant from the base station. Such reduction in the number of resource blocks may prevent the transmission power of the UE from exceeding the highest switching point of the power amplifier of the UE. As a result, the reporting of the reduced power headroom value (e.g., PH Reduced ) may enable the UE to limit the power consumption of the power amplifier.
  • the UE may report a value for PH Reduced (e.g., a negative value for PH Reduced ) that effectively reduces the transmission power to a value that is less than the highest switching point.
  • the UE may transmit the power headroom report.
  • the UE may determine a power headroom value for an uplink transmission.
  • the UE may determine the power headroom value (e.g., PH b, f, c (i, j, q d , l) ) using equation (3) as described herein.
  • the UE may include the power headroom value (e.g., the power headroom value determined at block 714) in the power headroom report (PHR) generated at block 710.
  • PHR power headroom report
  • the reporting of the power headroom value generated at block 710 may result in a higher number of resource blocks in a UL grant from the network (e.g., a base station) . This may allow the transmission power of the UE to exceed the highest switching point of the power amplifier of the UE and, therefore, may increase the power consumption of the power amplifier.
  • the network e.g., a base station
  • FIG. 8 is a flowchart 800 of a method of wireless communication.
  • the method may be performed by a UE (e.g., the UE 104, 602; the apparatus 902/902'; the processing system 1014, which may include the memory 360 and which may be the entire UE or a component of the UE, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359) .
  • a UE e.g., the UE 104, 602; the apparatus 902/902'; the processing system 1014, which may include the memory 360 and which may be the entire UE or a component of the UE, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359
  • blocks indicated with dashed lines indicate optional blocks.
  • the UE determines an uplink buffer size of the UE.
  • the uplink buffer size may be an amount of data that the UE plans to transmit in an uplink transmission.
  • the threshold may be a preconfigured buffer size value.
  • the value of the threshold may be set to 3 kilobytes.
  • the value of the threshold may be configurable.
  • the value of the threshold may be set to a default value of 3 kilobytes and may be increased to a higher value (e.g., a higher buffer size value) when the UE needs higher throughput, or may be decreased to a lower value (e.g., a lower buffer size value) when the UE can operate with a lower throughput.
  • the UE determines a reduced power headroom value (e.g., PH Reduced based on equation (4) ) to control an uplink transmission power.
  • a reduced power headroom value e.g., PH Reduced based on equation (4)
  • the UE determines the reduced power headroom value based on a switching point (e.g., PA_switching_point) of a power amplifier of the UE.
  • the switching point may be a transmission power value at which the power amplifier transitions to an operation mode with increased power consumption.
  • the switching point of the power amplifier is the highest switching point of the power amplifier.
  • the UE determines the reduced power headroom value by determining a difference between a switching point (e.g., PA_switching_point) of the power amplifier of the UE and a current transmission power (e.g., current P PUSCH ) of the UE, where the reduced power headroom value is less than the determined difference.
  • a switching point e.g., PA_switching_point
  • a current transmission power e.g., current P PUSCH
  • the UE transmits the reduced power headroom value to a network.
  • the UE may transmit a power headroom report (PHR) that includes the reduced power headroom value.
  • PHR power headroom report
  • the UE optionally receives an uplink resource allocation from the network based on the reduced power headroom value.
  • the uplink resource allocation includes a number of resource blocks (e.g., a value for the term in equations (1) and (2) ) for the uplink transmission, and the number of resource blocks ensures that the uplink transmission power is less than the switching point of the power amplifier.
  • the UE determines a power headroom value (e.g., PH b, f, c (i, j, q d , l) in equation (3) ) .
  • a power headroom value e.g., PH b, f, c (i, j, q d , l) in equation (3)
  • the UE transmits the power headroom value to the network.
  • the UE may transmit a power headroom report (PHR) that includes the power headroom value.
  • PHR power headroom report
  • the power headroom value may be greater than the reduced power headroom value.
  • FIG. 9 is a conceptual data flow diagram 900 illustrating the data flow between different means/components in an example apparatus 902.
  • the apparatus may be a UE.
  • the apparatus includes a reception component 904 that receives an uplink resource allocation 924 from the network (e.g., the base station 950) based on a reduced power headroom value, where the uplink resource allocation includes a number of resource blocks for the uplink transmission, and where the number of resource blocks ensures that the uplink transmission power is less than the switching point of the power amplifier.
  • the network e.g., the base station 950
  • the number of resource blocks ensures that the uplink transmission power is less than the switching point of the power amplifier.
  • the apparatus includes a transmission component 906 that transmits the reduced power headroom value 916 (e.g., in a power headroom report 922) to the network (e.g., the base station 950) or transmits the power headroom value 920 to the network (e.g., the base station 950) .
  • the apparatus further includes an uplink buffer size determination component 908 that determines an uplink buffer size of the apparatus and determines whether the uplink buffer size of the apparatus is greater than a threshold.
  • the apparatus further includes a reduced power headroom value determination component 910 that determines the reduced power headroom value 916 to control an uplink transmission power when the uplink buffer size is less than or equal to the threshold.
  • the apparatus further includes a power headroom value determination component 912 that determines the power headroom value 920 when the uplink buffer size is greater than the threshold.
  • the uplink buffer size determination component 908 may trigger (e.g., via a first control signal 918) the power headroom value determination component 912 to generate the power headroom value 920 when the when the uplink buffer size is greater than the threshold.
  • the uplink buffer size determination component 908 may trigger (e.g., via a second control signal 914) the reduced power headroom value determination component 910 to generate the reduced power headroom value 916 when the uplink buffer size is less than or equal to the threshold.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 7 and 8. As such, each block in the aforementioned flowcharts of FIGs. 7 and 8 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG. 10 is a diagram 1000 illustrating an example of a hardware implementation for an apparatus 902' employing a processing system 1014.
  • the processing system 1014 may be implemented with a bus architecture, represented generally by the bus 1024.
  • the bus 1024 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1014 and the overall design constraints.
  • the bus 1024 links together various circuits including one or more processors and/or hardware components, represented by the processor 1004, the components 904, 906, 908, 910, 912 and the computer-readable medium /memory 1006.
  • the bus 1024 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1014 may be coupled to a transceiver 1010.
  • the transceiver 1010 is coupled to one or more antennas 1020.
  • the transceiver 1010 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1010 receives a signal from the one or more antennas 1020, extracts information from the received signal, and provides the extracted information to the processing system 1014, specifically the reception component 904.
  • the transceiver 1010 receives information from the processing system 1014, specifically the transmission component 906, and based on the received information, generates a signal to be applied to the one or more antennas 1020.
  • the transceiver 1010 may include a power amplifier 1011 configured to drive the one or more antennas 1020.
  • the processing system 1014 includes a processor 1004 coupled to a computer-readable medium / memory 1006.
  • the processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1006.
  • the software when executed by the processor 1004, causes the processing system 1014 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 1006 may also be used for storing data that is manipulated by the processor 1004 when executing software.
  • the processing system 1014 further includes at least one of the components 904, 906, 908, 910, 912.
  • the components may be software components running in the processor 1004, resident/stored in the computer readable medium /memory 1006, one or more hardware components coupled to the processor 1004, or some combination thereof.
  • the processing system 1014 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359. Alternatively, the processing system 1014 may be the entire UE (e.g., see 350 of FIG. 3) .
  • the apparatus 902/902' for wireless communication includes means for determining an uplink buffer size of the apparatus, means for determining whether an uplink buffer size of the apparatus is greater than a threshold, means for determining a reduced power headroom value to control an uplink transmission power when the uplink buffer size is less than or equal to the threshold, means for transmitting the reduced power headroom value to a network, means for determining a power headroom value when the uplink buffer size is greater than the threshold, means for transmitting the power headroom value to the network, and means for receiving an uplink resource allocation from the network based on the reduced power headroom value, wherein the uplink resource allocation includes a number of resource blocks for the uplink transmission, and wherein the number of resource blocks ensures that the uplink transmission power is less than the switching point of the power amplifier.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 902 and/or the processing system 1014 of the apparatus 902' configured to perform the functions recited by the aforementioned means.
  • the processing system 1014 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.
  • TX activities are power consuming within which most of the power is consumed in PA---Power Amplifier.
  • higher TX power level means higher power consumption.
  • Power consumption of PA is not directly proportional to TX power level.
  • PA is working in different amplify state for different TX power level.
  • Char shows a typical example, it is a 3 amplify-state PA. Actually, it can be more or less.
  • Switching Point The edge between 2 states.
  • PUSCH TX power is defined as:
  • RB number plays a big rule in the TX power calculation.
  • network will reduce the scheduled the RB resources to ensure UE’s TX power is in capable range.
  • So PHR power headroom report
  • *PHR principle may refer to 38.213-7.7, 1
  • NW will reduce the RB in UL grant since UE has indicated no power headroom in PHR.
  • TX power will be limited and not exceed a pre-set Switching Point.
  • BS_THRESHOLD is configurable (e.g., adjustable) .
  • PA_Switching_Point the value depends on the HW characteristic of PA.

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Abstract

Un appareil détermine une taille de tampon de liaison montante de l'appareil, détermine si la taille de tampon de liaison montante de l'appareil est supérieure à un seuil, détermine une valeur de marge de puissance réduite permettant de commander une puissance de transmission de liaison montante lorsque la taille de tampon de liaison montante est inférieure ou égale au seuil, et transmet la valeur de marge de puissance réduite à un réseau.
PCT/CN2020/094275 2020-06-04 2020-06-04 Technologie phr pour une faible consommation d'énergie WO2021243626A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2020/094275 WO2021243626A1 (fr) 2020-06-04 2020-06-04 Technologie phr pour une faible consommation d'énergie

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WO2019015532A1 (fr) * 2017-07-21 2019-01-24 夏普株式会社 Procédé associé à un rapport de marge de puissance d'utilisateur, dispositif utilisateur, station de base et support lisible par ordinateur
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